How is radiometric dating used in the lunar geologic timescale?

The lunar geologic timescale divides the history of Earth's Moon into five recognized periods defined by large impact events and crater formation. Absolute ages for these periods are constrained using radiometric dating performed on samples gathered from the lunar surface. However, challenges such as intense bombardment history and correlating regolith samples with geological units leave debate concerning the ages of key events.

What we know

• The absolute ages of the periods in the lunar geologic timescale have been constrained by radiometric dating of samples obtained from the lunar surface. [2]
• The lunar geologic timescale divides the history of Earth's Moon into five periods: the Copernican, Eratosthenian, Imbrian, Nectarian, and Pre-Nectarian. [2]
• The boundaries of the lunar timescale are related to large impact events that modified the lunar surface, changes in crater formation, and crater size-frequency distribution. [2]
• Studies based on isotopic dating of the lunar magma ocean suggest the Moon formed 4.35 billion years ago. [3] · medium confidence

Still open

• There is ongoing debate concerning the ages of certain key events because correlating lunar regolith samples with geological units is difficult.
• Most lunar radiometric ages have been highly affected by an intense history of bombardment.

Where to go next

• whenWhat are the five periods of the lunar geologic timescale?
• what caused itHow do large impacts shape the lunar surface?
• the bigger pictureWhat is the role of chronostratigraphy in geology?
• what followedHow did the Artemis program restart lunar exploration?
• a case in pointWhat are the characteristics of the Pre-Nectarian period?
• an unexpected connectionHow does isotopic dating link magma oceans to the early Solar System?Isotopic dating of the lunar magma ocean provides clues that the Moon formed late in the history of the Solar System.

Sources

• [1]lunar geologic timescale (Wikidata Q386638) · CC0 1.0
• [2]Lunar geologic timescale · CC BY-SA 4.0
• [3]Moon · CC BY-SA 4.0
• [4]Pre-Nectarian · CC BY-SA 4.0
• [5]Geologic time scale · CC BY-SA 4.0